HEIDENHAIN TNC 620 User Manual page 467

Compensating the machine kinematics in ACTUAL/
NOMINAL positions at end of block: M144 (option 9)
Standard behavior
If the kinematics change, e.g. by inserting a spindle attachment
or entering an inclination angle, the control does not compensate
this modification. If the operator does not take this modification to
the kinematics into account in the NC program, offset machining is
executed.
Behavior with M144
The M144 function enables the control to consider the modification
to the machine kinematics in the position display and compensate
the offset of the tool tip in relation to the workpiece.
Positioning blocks with M91/M92 are permitted if
M144 is active.
The position display in the operating modes Program
run full sequence and Program run single block
does not change until the tilting axes have reached
their final position
Effect
M144 becomes effective at the start of the block. M144 does not
function in connection with M128 or a tilted working plane.
You can cancel M144 by programming M145.
The machine geometry must be specified by the
machine tool builder in the description of kinematics.
The machine tool builder determines the behavior in
the automatic and manual operating modes. Refer to
your machine manual.
HEIDENHAIN | TNC 620 | ISO Programming User's Manual | 9/2016
Miscellaneous functions for rotary axes 12.4
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467